I've never encountered a high volume mould tool that was less than $50k. In addition to being two piece is it also a low complexity part, e.g. just a few straight faces with pretty lose tolerances? I'm still amazed you got it that cheaply - where did have it made?

I should have stated above that I am neither an injection moulding expert, nor even a mechanical engineer. My experience is as tech lead for years of projects needing injection moulded parts, so I've worked through options with mechies, recommended things for purchase etc. Would be very to happy to learn of cheaper ways of getting stuff made!